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Midterm

Mcgill - psyc 204 midterm review
Mcgill - psyc 204 midterm review

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School
McGill University
Department
Psychology
Course
PSYC 204
Professor
David Ostry
Semester
Winter

Description
Psyc 204 Midterm I study guideTopic 1A What are statistics1 Applications political polls weather drug trials2 Statistics are tools a describe populations samples b decision making in uncertain cases based on samplesB Population vs Sample1 Populationall instances on some quantitative dimensionRefers to a defined group or aggregate2 Sample a subset of all instances on some quantitative dimensionRefers to subgroups or subaggregates drawn by some appropriate method from a populationC Two Areas of Statistics1 Descriptive statistics Parameter a property descriptive of a population and Estimate to a property of a sample drawn at random from a populationStatistical procedures used in describing the properties of samples or of populations where complete population data are availableDo not allow us to make conclusions beyond the data we have analyzed or reach conclusions regarding any hypotheses we might have madeJust a way to describe data2 Inferential statistics Draw conclusions about populations based on information from samples Statistical procedures used in the drawing of inferences about the properties of populations from sample dataD Variables X Y Represent measurements in samples and populations1 Differences vs SimilaritiesA Variables x y assume a range of valuesB Constant c5 a property whereby the members of a group do not differ2 Dependent Y vs Independent X measurement versus manipulations3 Discrete takes specific values only finite set of values vs Continuous any value within a defined range of values infinite number4 Types of variables Qualitative Nominal a property of the members of a group defined by an operation which permits the making of statements only of equality or difference eg eye color political parties and Ordinala property defined by an operation which permits the rank ordering of the members ofa group statements of greater than or less than eg letter gradesQuantitative Intervala property defined by an operation which permits the making of statements of equalityof intervals in addition to statements of sameness or difference or greater than or less than arbitrary 0 eg temperature calendar timeand Ratio a property defined by an operation which permits the making of statements of equality ofratios in addition to all other kinds of statements meaningful 0 eg weight lengthE Summation Notation1 Definition of Symbolsa Variables attributes take a range of values designated by a capital letter specific value
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